The end result in Afghanistan, if all goes well, will be a nominal national government that controls the capital region and reigns but does not rule local tribes and which actually helps the locals a bit rather than sucking resources from the locals, who in turn do not make trouble for the central government or allow their areas to be used by jihadis to plan attacks on the West. We press for reasonable economic opportunities, with bribes all around (I mean, foreign aid), to keep a fragile peace.
And we stick around this time, unlike after the Soviets left Afghanistan when we ignored the place, for a generation or two to see if we can move Afghanistan into the 19th century (hey, let's not get ahead of ourselves).
Good thing my hopes aren't high. The place is a mess and we can only do so much to help Afghans.
Keeping them from hurting us is my bottom line. Killing Osama bin Laden was nice but does not have any effect on judging whether my minimal objectives are achieved.